std: net: uefi: Add support to query connection data #143838

Ayush1325 · 2025-07-12T13:26:06Z

Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay, peer_addr and socket_addr.
peer_addr is needed for implementation of accept.
cc @nicholasbishop
Also a heads up. The UEFI spec seems to be wrong or something for EFI_TCP4_CONFIG_DATA. ControlOption should be a pointer as seen in edk2.

rustbot · 2025-07-12T13:26:10Z

rustbot has assigned @tgross35.
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tgross35

Just one nit from me, if @nicholasbishop can review as well that would be ideal

tgross35 · 2025-07-18T17:52:09Z

library/std/src/sys/net/connection/uefi/tcp4.rs

+        };
+
+        if r.is_error() {
+            return Err(io::Error::from_raw_os_error(r.as_usize()));


Suggested change

return Err(io::Error::from_raw_os_error(r.as_usize()));

Err(io::Error::from_raw_os_error(r.as_usize()))

Fixed, Thanks.

nicholasbishop · 2025-07-22T19:32:23Z

library/std/src/sys/net/connection/uefi/tcp4.rs

@@ -67,6 +68,29 @@ impl Tcp4 {
        if r.is_error() { Err(crate::io::Error::from_raw_os_error(r.as_usize())) } else { Ok(()) }
    }

+    pub(crate) fn get_mode_data(&self) -> io::Result<tcp4::ConfigData> {
+        // Using MaybeUninit::uninit() generates a Page Fault Here
+        let mut config_data: MaybeUninit<tcp4::ConfigData> = MaybeUninit::zeroed();


nit: Could you use ConfigData::default() here instead of MaybeUninit? Slightly simpler, and then the unsafe assume_init isn't needed.

Well, isn't MaybeUninit designed to be used in such cases?

Yes, but it should only be used if necessary for performance. I wouldn't think that's a concern here, so I'd rather have simpler code and one fewer unsafe blocks.

Well, isn't MaybeUninit designed to be used in such cases?

Technically yes it works here, but if there's a better option that reduces unsafe then there isn't any reason not to use it.

With MaybeUninit::zeroed() and later calling assume_init(), the assumption is made that zero is a valid bitpattern for all fields that (*protocol).get_mode_data doesn't overwrite. This is a nontrivial interaction and really be in a SAFETY comment. Also apparently get_mode_data expects at least partially initialized data if there is a page fault with uninit (presumably trying to read the pointer if nonnull?).

If you use default() then all these assumptions can go away. It's also more robust against adding/changing fields across a crate version bump.

Ok, switched to using default. Also tested on ovmf.

nicholasbishop · 2025-07-22T19:34:41Z

library/std/src/sys/pal/uefi/helpers.rs

@@ -761,3 +761,7 @@ impl Drop for OwnedEvent {
 pub(crate) const fn ipv4_to_r_efi(addr: crate::net::Ipv4Addr) -> efi::Ipv4Address {
    efi::Ipv4Address { addr: addr.octets() }
 }
+
+pub(crate) const fn ipv4_from_r_efi(ip: efi::Ipv4Address) -> crate::net::Ipv4Addr {
+    crate::net::Ipv4Addr::new(ip.addr[0], ip.addr[1], ip.addr[2], ip.addr[3])


nit: I think this could be simplified to crate::net::Ipv4Addr::from(ip.addr) (see https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#impl-From%3C%5Bu8;+4%5D%3E-for-Ipv4Addr)

So From is not constant. I would prefer to keep this function constant.
There does exist from_octets, but that's experimental right now. I can enable the feature, but well I just thought this way might be better.

Yep fine to leave as-is, I missed that it's constant.

- Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay, peer_addr and socket_addr. - peer_addr is needed for implementation of `accept`. Signed-off-by: Ayush Singh <ayush@beagleboard.org>

tgross35 · 2025-07-23T09:48:17Z

@bors r+

bors · 2025-07-23T09:48:20Z

📌 Commit eb9c654 has been approved by tgross35

It is now in the queue for this repository.

…=tgross35 std: net: uefi: Add support to query connection data - Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay, peer_addr and socket_addr. - peer_addr is needed for implementation of `accept`. - cc `@nicholasbishop` - Also a heads up. The UEFI spec seems to be wrong or something for [EFI_TCP4_CONFIG_DATA](https://uefi.org/specs/UEFI/2.11/28_Network_Protocols_TCP_IP_and_Configuration.html#efi-tcp4-protocol-getmodedata). `ControlOption` should be a pointer as seen in [edk2](https://github.com/tianocore/edk2/blob/a1b509c1a453815acbc6c8b0fc5882fd03a6f2c0/MdePkg/Include/Protocol/Tcp4.h#L97).

…=tgross35 std: net: uefi: Add support to query connection data - Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay, peer_addr and socket_addr. - peer_addr is needed for implementation of `accept`. - cc ``@nicholasbishop`` - Also a heads up. The UEFI spec seems to be wrong or something for [EFI_TCP4_CONFIG_DATA](https://uefi.org/specs/UEFI/2.11/28_Network_Protocols_TCP_IP_and_Configuration.html#efi-tcp4-protocol-getmodedata). `ControlOption` should be a pointer as seen in [edk2](https://github.com/tianocore/edk2/blob/a1b509c1a453815acbc6c8b0fc5882fd03a6f2c0/MdePkg/Include/Protocol/Tcp4.h#L97).

…=tgross35 std: net: uefi: Add support to query connection data - Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay, peer_addr and socket_addr. - peer_addr is needed for implementation of `accept`. - cc ```@nicholasbishop``` - Also a heads up. The UEFI spec seems to be wrong or something for [EFI_TCP4_CONFIG_DATA](https://uefi.org/specs/UEFI/2.11/28_Network_Protocols_TCP_IP_and_Configuration.html#efi-tcp4-protocol-getmodedata). `ControlOption` should be a pointer as seen in [edk2](https://github.com/tianocore/edk2/blob/a1b509c1a453815acbc6c8b0fc5882fd03a6f2c0/MdePkg/Include/Protocol/Tcp4.h#L97).

Rollup of 15 pull requests Successful merges: - #132748 (get rid of some false negatives in rustdoc::broken_intra_doc_links) - #143374 (Unquerify extern_mod_stmt_cnum.) - #143838 (std: net: uefi: Add support to query connection data) - #144014 (don't link to the nightly version of the Edition Guide in stable lints) - #144094 (Ensure we codegen the main fn) - #144218 (Use serde for target spec json deserialize) - #144221 (generate elf symbol version in raw-dylib) - #144240 (Add more test case to check if the false note related to sealed trait suppressed) - #144247 (coretests/num: use ldexp instead of hard-coding a power of 2) - #144276 (Use less HIR in check_private_in_public.) - #144317 (pass build.npm from bootstrap to tidy and use it for npm install) - #144320 (rustdoc: avoid allocating a temp String for aliases in search index) - #144334 (rustc_resolve: get rid of unused rustdoc::span_of_fragments_with_expansion) - #144335 (Don't suggest assoc ty bound on non-angle-bracketed problematic assoc ty binding) - #144358 (Stop using the old `validate_attr` logic for stability attributes) r? `@ghost` `@rustbot` modify labels: rollup

…=tgross35 std: net: uefi: Add support to query connection data - Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay, peer_addr and socket_addr. - peer_addr is needed for implementation of `accept`. - cc ````@nicholasbishop```` - Also a heads up. The UEFI spec seems to be wrong or something for [EFI_TCP4_CONFIG_DATA](https://uefi.org/specs/UEFI/2.11/28_Network_Protocols_TCP_IP_and_Configuration.html#efi-tcp4-protocol-getmodedata). `ControlOption` should be a pointer as seen in [edk2](https://github.com/tianocore/edk2/blob/a1b509c1a453815acbc6c8b0fc5882fd03a6f2c0/MdePkg/Include/Protocol/Tcp4.h#L97).

Rollup of 16 pull requests Successful merges: - #143374 (Unquerify extern_mod_stmt_cnum.) - #143838 (std: net: uefi: Add support to query connection data) - #144014 (don't link to the nightly version of the Edition Guide in stable lints) - #144094 (Ensure we codegen the main fn) - #144218 (Use serde for target spec json deserialize) - #144221 (generate elf symbol version in raw-dylib) - #144232 (Implement support for `become` and explicit tail call codegen for the LLVM backend) - #144240 (Add more test case to check if the false note related to sealed trait suppressed) - #144247 (coretests/num: use ldexp instead of hard-coding a power of 2) - #144276 (Use less HIR in check_private_in_public.) - #144278 (add Rev::into_inner) - #144317 (pass build.npm from bootstrap to tidy and use it for npm install) - #144320 (rustdoc: avoid allocating a temp String for aliases in search index) - #144334 (rustc_resolve: get rid of unused rustdoc::span_of_fragments_with_expansion) - #144335 (Don't suggest assoc ty bound on non-angle-bracketed problematic assoc ty binding) - #144358 (Stop using the old `validate_attr` logic for stability attributes) r? `@ghost` `@rustbot` modify labels: rollup

Rollup of 15 pull requests Successful merges: - #143374 (Unquerify extern_mod_stmt_cnum.) - #143838 (std: net: uefi: Add support to query connection data) - #144014 (don't link to the nightly version of the Edition Guide in stable lints) - #144094 (Ensure we codegen the main fn) - #144218 (Use serde for target spec json deserialize) - #144221 (generate elf symbol version in raw-dylib) - #144240 (Add more test case to check if the false note related to sealed trait suppressed) - #144247 (coretests/num: use ldexp instead of hard-coding a power of 2) - #144276 (Use less HIR in check_private_in_public.) - #144278 (add Rev::into_inner) - #144317 (pass build.npm from bootstrap to tidy and use it for npm install) - #144320 (rustdoc: avoid allocating a temp String for aliases in search index) - #144334 (rustc_resolve: get rid of unused rustdoc::span_of_fragments_with_expansion) - #144335 (Don't suggest assoc ty bound on non-angle-bracketed problematic assoc ty binding) - #144358 (Stop using the old `validate_attr` logic for stability attributes) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #143838 - Ayush1325:uefi-tcp4-config-data, r=tgross35 std: net: uefi: Add support to query connection data - Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay, peer_addr and socket_addr. - peer_addr is needed for implementation of `accept`. - cc `````@nicholasbishop````` - Also a heads up. The UEFI spec seems to be wrong or something for [EFI_TCP4_CONFIG_DATA](https://uefi.org/specs/UEFI/2.11/28_Network_Protocols_TCP_IP_and_Configuration.html#efi-tcp4-protocol-getmodedata). `ControlOption` should be a pointer as seen in [edk2](https://github.com/tianocore/edk2/blob/a1b509c1a453815acbc6c8b0fc5882fd03a6f2c0/MdePkg/Include/Protocol/Tcp4.h#L97).

…=tgross35 std: net: uefi: Add support to query connection data - Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay, peer_addr and socket_addr. - peer_addr is needed for implementation of `accept`. - cc `````@nicholasbishop````` - Also a heads up. The UEFI spec seems to be wrong or something for [EFI_TCP4_CONFIG_DATA](https://uefi.org/specs/UEFI/2.11/28_Network_Protocols_TCP_IP_and_Configuration.html#efi-tcp4-protocol-getmodedata). `ControlOption` should be a pointer as seen in [edk2](https://github.com/tianocore/edk2/blob/a1b509c1a453815acbc6c8b0fc5882fd03a6f2c0/MdePkg/Include/Protocol/Tcp4.h#L97).

rustbot assigned tgross35 Jul 12, 2025

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jul 12, 2025

Ayush1325 mentioned this pull request Jul 14, 2025

Tracking Issue for uefi-std #100499

Open

tgross35 reviewed Jul 18, 2025

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Ayush1325 force-pushed the uefi-tcp4-config-data branch from db1e118 to 883e25c Compare July 18, 2025 18:02

nicholasbishop approved these changes Jul 22, 2025

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std: net: uefi: Add support to query connection data

eb9c654

- Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay, peer_addr and socket_addr. - peer_addr is needed for implementation of `accept`. Signed-off-by: Ayush Singh <ayush@beagleboard.org>

Ayush1325 force-pushed the uefi-tcp4-config-data branch from 883e25c to eb9c654 Compare July 23, 2025 05:53

tgross35 approved these changes Jul 23, 2025

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bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 23, 2025

fmease mentioned this pull request Jul 23, 2025

Rollup of 16 pull requests #144380

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Rollup of 15 pull requests #144382

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Rollup of 15 pull requests #144384

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Rollup of 16 pull requests #144387

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Rollup of 15 pull requests #144398

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bors merged commit 319d54f into rust-lang:master Jul 24, 2025
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rustbot added this to the 1.90.0 milestone Jul 24, 2025

Ayush1325 deleted the uefi-tcp4-config-data branch July 25, 2025 03:41

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	return Err(io::Error::from_raw_os_error(r.as_usize()));
	Err(io::Error::from_raw_os_error(r.as_usize()))

std: net: uefi: Add support to query connection data #143838

std: net: uefi: Add support to query connection data #143838

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